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Finding the Fourth Proportional to 806.50, 1,206.06 and 689.86

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Solution

The fourth proportional to 806.50, 1,206.06 and 689.86 is: 1,031.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    806.50 : 1,206.06 = 689.86 : x
  2. Step 2: Convert to fraction form
    806.50/1,206.06 = 689.86/x
  3. Step 3: Cross multiply
    806.50x = 1,206.06 × 689.86
  4. Step 4: Simplify right side
    806.50x = 832,012.55
  5. Step 5: Solve for x
    x = 832,012.55/806.50
  6. Step 6: Final answer
    x = 1,031.63

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.